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A disaccharide or biose〔(Biose on www.merriam-webster.org )〕 is the carbohydrate which is formed when two monosaccharides (simple sugars) undergo a condensation reaction which involves the elimination of a small molecule, such as water, from the functional groups only. Like monosaccharides, disaccharides are soluble in water. Three common references are sucrose, lactose, and maltose. "Disaccharide" is one of the four chemical groupings of carbohydrates (monosaccharide, disaccharide, oligosaccharide, and polysaccharide). The most common types of disaccharides—sucrose, lactose, and maltose—have twelve carbon atoms, with the general formula C12H22O11. The differences in the disaccharides are due to atomic arrangements within the molecule. ==Classification== There are two different types of disaccharides: *Reducing disaccharides, in which one monosaccharide, the reducing sugar, still has a free hemiacetal unit; and non-reducing disaccharides, in which the components bond through an acetal linkage between their anomeric centers and neither monosaccharide has a free hemiacetal unit. Cellobiose and maltose are examples of reducing disaccharides. *Sucrose and trehalose are examples of non-reducing disaccharides. 〔(【引用サイトリンク】url=http://faculty.virginia.edu/mcgarveylab/Carbsyn/Carblist/html/disacch.html )〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「disaccharide」の詳細全文を読む スポンサード リンク
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